So this one has been an interesting one. I have a DP 770 on a TA 4500i where the upper limit sensor for the lift is working backwards. It is changing state but in reverse. If you barely lift the feed system to block the sensor and press start the tray will lift and pull paper. I have replaced the sensor, wiring harness, DP main board, and the relay board. I've talked to Kyo tech support 4 times and each tech I talk to all says the same thing. "Wow that's really weird". Should hear from Kyo rep to come out soon but like to hear you guy's thoughts on this one.
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"In a cruel and evil world, being cynical can allow you to get some entertainment out of it."
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Re: DP 770 upper lift sensor working backwards
The way I see it you've got three possibilities:
1) SDULS SD upper limit sensor (unlikely, if it's changing state it's probably working properly).
2) SDMPB Side Deck Controller
YC5-14 1.2vdc supply
YC5-15 ground
YC5-16 signal 0/3.3vdc ON/OFF
YC13-1 Serial Communication to Engine PWB
YC13-2 Serial Communication to Engine PWB
YC13-3 Clock Signal to Engine PWB
It's possible that the side deck controller is reading the sensor incorrectly, or reading it correctly but incorrectly translating the serial data to the engine PWB.
3) EPWB Engine PWB
YC19-A4 Serial Communication from SDMPB
YC19-A2 Serial Communication from SDMPB
YC19-A1 Clock Signal from SDMPB
The engine PWB may be incorrectly reading the serial data from the SD controller.
I think I would start with reading SDULS at SDMPB YC5-14, 15, 16. If you can see it change state from 0 to 3.3vdc then ... I would pin out the connections between the SDMPB YC13 and the EPWB YC19. Then I would swap the side deck to another Alphard. If the problem follows the deck I would change SDMPB. If the problem follows the MFP I would change E PWB. Logical?
=^..^=If you'd like a serious answer to your request:
1) demonstrate that you've read the manual
2) demonstrate that you made some attempt to fix it.
3) if you're going to ask about jams include the jam code.
4) if you're going to ask about an error code include the error code.
5) You are the person onsite. Only you can make observations.
blackcat: Master Of The Obvious =^..^= -
Re: DP 770 upper lift sensor working backwards
The problem is the holder for the feed rollers, P/n 303JX07030. It cracks and when it is raised in the feed process it raises out of the sensor range. the specific problem is the stop on the back side of the holder breaks off or the frame cracks and allows the holder to rise to far causing the problem. A quick field fix is to add 1/4 inch of black tape to the bottom of the flag the sensor sees, but to fix it permanently replace the holder.Comment
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Re: DP 770 upper lift sensor working backwards
The only thing I can offer is, we kept getting tray down errors on an 6551ci DP. We replaced the up & down sensors, motor & board and they continued. Our rep suggested that we replace ALL sensors in the document processor. Said they had a finisher with odd problems that did that. It ended up correcting ours.Comment
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Re: DP 770 upper lift sensor working backwards
This here is close to what is actually wrong with it. We emailed our regional tech rep and he sent me the solutions. there is a tab on the front of the feed assembly that breaks causing the assembly to drop about 1/4 in. If you don't know what to look for you can easily miss this. And just to think a few weeks ago here I was telling our 2 rookies that sometimes we look to far into some of the simplest fixes and here I got caught in one. I know we all had it happen. Tho I spoke with Kyo tech support 3 or 4 times and no one ever said to look for this but it was the first thing the tech rep suggested."In a cruel and evil world, being cynical can allow you to get some entertainment out of it."
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If you'd like a serious answer to your request:
1) demonstrate that you've read the manual
2) demonstrate that you made some attempt to fix it.
3) if you're going to ask about jams include the jam code.
4) if you're going to ask about an error code include the error code.
5) You are the person onsite. Only you can make observations.
blackcat: Master Of The Obvious =^..^=Comment
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Re: DP 770 upper lift sensor working backwards
I had never seen it before, but when I emailed the regional tech rep he had and told me to look for that right away. What annoyed me was I had talk to tech support 3 or 4 times and they had not mentioned that at all."In a cruel and evil world, being cynical can allow you to get some entertainment out of it."
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Re: DP 770 upper lift sensor working backwards
dp770 feed problems - Topic
Knew I seen it before see post from this forum. The guy got the resolve.Comment
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Re: DP 770 upper lift sensor working backwards
I had another tech ask me about an issue he was having and thanks to this post I pointed him in the right direction. Saved me a road trip anyways.
So I had him grab a couple pictures for anyone that hasn't had the pleasure of seeing this. Thanks to you allComment
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Re: DP 770 upper lift sensor working backwards
Yep that is it. If you don't know to look for it you will miss it rather easily."In a cruel and evil world, being cynical can allow you to get some entertainment out of it."
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